Thur experience for Cost (Material & Labor) what have you found to be the most cost effective combination of pipe & wire??? Pvc Sch. 40 with Alum or Copper . I;m looking for 3000 amps. Another words 500 mcm , 750, 1000 copper or alum. 4 wires in a conduit. Useing 310.16 75C & 110.14c for terms. Yoopers Also mostly 480 volt loads so Neutral can be 12 1/2 percent of phase conductors right.
Another consideration with bus duct is the difference in labor hours. Slap up 1 10' length of bus duct and you're done with 10' of feed. For 10' of conduit you still have to pull and terminate the wires...PLUS you have multiple sets of everything.
#177571 - 05/07/0807:01 PMRe: 2500 KVA 480/277 secondary Transformer conduit & w
Ernie- You've left out some details (as usual) and I wonder if the question factors in the grounding conductor? With metal raceway - no ground wire- with non-metallic you will need a ground wire- since this is not service. Right? Wrong?
George Service conduits from utility Co, transformer to Service gear that means NO GROUND WIRE. Total run is Aprox. 40feet and yes I know about requrements of Parrell runs. Buss 90's if you've ever installed then cost a bundle as well as regular buss. But I agree worth a price compaireson.